Made hand-painted custom pony shirts for my friends for Christmas a few years back. Personalized colors, personalized cutie marks--they were a hit. I made 9 of them and I hated tshirts for a while from the sheer boredom of painting that many crazy letters. BUT they turned out awesome.
Want one of these, to show off that you also thing that friendship is f***ing awesome? $30 plus shipping. Ask me anything.