I'll be going to the Vancouver show alone, the second one, and i think it's a great way to meet new people, at least everyone has something in common, or at least they should, we all LOVE Coldplay!
Yes, definitely, i was thinking of painting mine and the only thing i can think of is maybe something to do with the album covers, but then again if one could do it really well then i would suggest trying one of the band photos.