There are always Ohlins stickers on eBay. A quick search showed THESE.
They're not exactly what you want, but if the decal supplier has got the logo in some sort of drawing software they should be able to scale it to whatever size you want and print it in whatever colour you want on whatever colour backing
All you need is a photo and sizing.Any decent graphics place will make you a set up.I had a new one(blue on clear background) made up by The Image Works for my rear shock.
It seems people seem to have missed my post,above.I had some made by The Image works.They can do you them.I sent the original off the shock,and they just copied it.Sorry about the flash,without it,it looks alot darker blue than they are.