OK, for what its worth:
Something that conveys what everyone loves about paintball. You'll need to capture the excitement and adrenalin with the artwork. Not too many words. Need a big phone number and web address. Both need to be memorable as people driving past dont have time to take much in. Paintball.co.uk is a whole lot easier to take in and remember than surrey-paintballUK.org.uk or whatever. (hope no-one actually uses that address
)
In short if its a road-side thing it needs to
a) make an instant impact that makes you want to remember it and
b) have enough info to let people find you on the phone/web when they get home.
I'd have thought it'd be easier to do a rec-ball thing. Most tourney players know why paintball is great, where the sites are and how to find them etc.