My wonderful affiliate icondust, who has four promo icons of them together here.
zerosugar has a few of them from the pilot being cute and snuggly on the Riggin's couch here.
There is also a Livejournal community exclusively for FNL icons, and I think that I saw some there from Tyra/Tim shippers when I was PBing Taylor once upon a time.
If you need more, or have a specific scene in mind, let me know and I'll gladly make what you need. I love that show so hard, and am in the process of making an Adrianne set anyway.