My concept:

• a 5x7" birthday greeting card from a group
• a thumbnail concept from my bullet journal with "we really carrots your birthday"
• a colorful and retro palette featuring orange, green, and blue
• fun, loose, un-fussy lettering, no script

My Thumbnail

My sketch

My final illustration

I think I may do some lettering for the inside that says "please lettuce celebrate you" :)