*NOTE* Most allow art as well. "Claim couples" does not necessarily mean the couples must be romantic, and sometimes threesomes and moresomes are allowed. Some communities merely ask for one genre (i.e. smut) but do not require it. Always check the comm info to be sure.

Various Themes

Community	Themes	Sets	Fandom	Description
100quills	50/100	8	Harry Potter	Write HP works from 50 or 100 themes on 4 sets each.
one_liners	25/50/100	5/5/2	All/Multi	Write one sentence from 25, 50, or 100 themes on 5, 5, or 2 sets, respectively.
story_arc	5/10/15 20/30	5/4/3 2/2	All/Multi	Write/Draw an arc or multi-chaptered works from 5, 10, 15, 20, or 30 themes on 5, 4, 3, 2, and 2 sets, respectively.

[Total | 3]

*NOTE* Most allow art as well. "Claim couples" does not necessarily mean the couples must be romantic, and sometimes threesomes and moresomes are allowed. Some communities merely ask for one genre (i.e. smut) but do not require it. Always check the comm info to be sure.

0-20 Themes

Community	Themes	Sets	Fandom	Description
12daysof	12	16	All/Multi	Write from 12 holiday themes on 16 sets, relevant to the holiday/season of the set claimed.
daysoftheweek	7	1	All/Multi	Write from 7 out of 21 themes, mentioning the day of the week in each work.
drabble123	20	8	All/Multi	Write 100, 200, or 300 words from 20 themes on 8 sets.
everyfiveyears*	--	--	All	Write a fic for every five years of a character's life. Claim characters.
mix_n_make*	--	--	All	Write/Draw from a playlist of your making.

*Not exactly themed communities, just claiming or a choose-your-own themes.

[Total | 5]

*NOTE* Most allow art as well. "Claim couples" does not necessarily mean the couples must be romantic, and sometimes threesomes and moresomes are allowed. Some communities merely ask for one genre (i.e. smut) but do not require it. Always check the comm info to be sure.

25 Themes

Community	Themes	Sets	Fandom	Description
25moments	25	1	All/Multi	Write from 25 themes. No claims.
25prompts	25	10	All/Multi	Write from 25 themes on 10 sets, some having specific rules.
femslash25	25	3	All – Femslash	Write femslash from 25 themes on 3 sets.

[Total | 3]

*NOTE* Most allow art as well. "Claim couples" does not necessarily mean the couples must be romantic, and sometimes threesomes and moresomes are allowed. Some communities merely ask for one genre (i.e. smut) but do not require it. Always check the comm info to be sure.

100 Themes

Community	Themes	Sets	Fandom	Description
fanfic100	100	1	All	Write from 100 themes.
finalfantasy100	100	1	Final Fantasy	Write FF works from 100 themes.

[Total | 2]

*NOTE* Most allow art as well. "Claim couples" does not necessarily mean the couples must be romantic, and sometimes threesomes and moresomes are allowed. Some communities merely ask for one genre (i.e. smut) but do not require it. Always check the comm info to be sure.

50 Themes

Community	Themes	Sets	Fandom	Description
1sentence	50	4	All/Multi	Write a sentence on each of the 50 themes on 4 sets. Claim couples.
50alternates	50	2	Multi	Write historical or fantasy AUs from 50 themes on 2 sets.
50drabbles	50	15	All/Multi	Write drabbles from 50 themes on 15 sets.
50episodes	50	17	All/Multi	Write scenes from 50 themes on 17 sets.
50harlequins	50	1	All/Multi	Write romance clichés from 50 themes.
50originals	50	10	Original	Write original works from 50 themes on 10 sets. No claims.
au50	50	3	Multi	Write AUs from 50 themes on 3 sets.
fanfic50	50	4	All	Write from 50 themes on 4 sets.

[Total | 8]

*NOTE* Most allow art as well. "Claim couples" does not necessarily mean the couples must be romantic, and sometimes threesomes and moresomes are allowed. Some communities merely ask for one genre (i.e. smut) but do not require it. Always check the comm info to be sure.

30 Themes

Community	Themes	Sets	Fandom	Description
30_darkfics	30	1	All/Multi	Must be at least 18. Write dark works from 30 themes.
30for3	30	2	All/Multi	Write/Draw from 30 themes on 2 sets. Claim threesomes or moresomes.
30_kisses	30	2	All/Multi	Write/Draw from 30 themes on 2 sets with a kiss in each work. Claim couples.
30straightdays*	30	--	All	Write through 30 days of a character's life. Claim characters.
30_somethings	30	11	All	Write from 30 themes on 11 sets.

*Not exactly themed communities, just claiming or a choose-your-own themes.

[Total | 5]