I've had at least half a dozen offers through Etsy from professional photographers offering swaps, and I haven't taken them up yet. Silly, silly me. I misguidedly thought my pictures were good enough, and then I came across this on Flickr:
I sold this organic owl t-shirt a couple months back and didn't realise my customer was a professional photographer. Wow, what a photo! It made Explore #1 on Flickr and won awards!
So, lesson learned. I'll be accepting photo swaps post haste.