Of course you can make an icon! It's yours, after all!
As for Hump_day, you post as often or as little as you like. We have weekly prompts, and you just pick what you want, or don't want, and sign up for those weeks.
Also, you don't actually post, you just email your art to the week's host and they post for you.
Are you on eljay? Or only eyejay? I *think* you have to have an eljay account to be a 'member' so that you can see the members only posts and reminders and such.