It's all inclusive! There is very little, if any, snobbery in the artist trading card community. Kids do it, moms do it, hip professionals do it, teens do it... pretty much anyone can draw a tiny picture, take a pretty photo or assemble a little collage. And then trade it!
Mail is fantastic. Especially real mail with your name on it. Especially real mail with little doodles on the envelopes which are filled with tiny pieces of art and sometimes a letter or a card. If you're really lucky, sometimes the sender includes a surprise extra! Score!