Why photoshop this to a higher res?? Stick it in inkscape, double or triple the size, et voila. It will make it a vector so if u wanted it 1km in size, you could without pixelating it.
Right without further without further adieu I bring you the finished poster
The attached zip conatins and A4 PNG in each colour and an EPS Vector for your T-Shirt Printing Needs.
Nice One Paul! :) I Love It!
I would love this on a T-Shirt in the same format as you have previewed there! ;) it would look pretty ace! :P
I'm thinking of putting something along the lines of this up in our office.