Acorn's line of 8 bit computers are in my opinion wonderful machines and got better with every model... a shame they were always stuck with a maximum of 8 colours per screen. 16 colour modes were just 8 colours plus 8 flashing combinations... 
Well the awesome RobC over on the *. forums has come up with a replacement ULA that does rather better, how about a fully programmable pallet of 4096 colours plus some very nice new modes with total compatibility and the ability to recolour existing games / software?
I got my latest rectangle of awesome through the post today and here it is in my Model B:

VideoNuLA Top Centre
*DO NOT PUT IT HERE*
VideoULA socket NOT SerialULA socket
(FDD Upgrade Midddle Left)

IntegraB Kindly Repaired By Bas
(Along With CF HDD and MMC, 64k ROM Mod, 'n stuff)

10quid CoPro, by Hoglet & Co
(*. forum again)
I just wanted to express my public thanks to all the above, and more, who continue to add so much win to these machines.