So, change the color! Let's see... popular colors to contrast with purple... yellow, orange....
If you don't find someone on the forum who will give you a price you like, check out cafepress.com zazzle.com or vistaprint.com I think they're all dot coms, but you would know if you got the right one, anyway. Lots of great products with these companies. I've bought from all 3, I think. Not sure about cafepress, but I know there are a couple of major items I'll be using them for, soon. (Christmas gifts)
Make sure you have free rights to the artwork or that you know and agree to their stipulations (in writing) before you use it. I know some folks who are going through some tough stuff over artwork, right now, and it's gonna cost them a bit of money. I would NOT like to see a kid-supporting organization hit by something so menial as an issue over artwork.
Good luck!