i love the tree idea, with perhaps the letter hanging from it in wonderful mixed prints and colors.... if you make them small enough they could be in the shape of each letter... S E L F or the letters each cute from fabric or color and print... in a different shape for each (or font).... the leaves for the flowers could resemble smiles of a sort.... perhaps curly hair, spiked hair, smooth hair. briaded hair... sorry i get carried away... make it fun and be sure to post it... good luck and bless you for doing this...
i have a son in "rehab" right this minute and thank GOD for people like you....