This month is all about nature.
Here's what n900hacker said:
"I think that 'wild nature' can be a good theme for the next camera phone competition. Everything wild, like trees, falls, rain, leaves, bushes and forests is accepted. I choose this theme because i think that we're always taking photos of man-made only subjects, so nature can be a good challenge for everyone!"

I think that's about enough.

The rules:
Photos must be taken during this month.
Photos must be taken by the posting member.
Photos must be taken with a camera phone.
Users must name the phone used to shoot the picture.
Users must add a link to the original photo with EXIF.
Users can change the entry only once.
Last three days of this month are for voting.

I don't think there could be a better theme for May. It's very sunny now, can't wait for the school to end!