Whilst looking for something new and fun to wear to work (on the days that my E14 T-shirts are all in the wash) and on those days I wasn't having to meet anyone important, I finally found the following:
For completeness, although I have no affiliation with them, this was on a website called Redbubble.
tariq.ahmad e14phil cstanton - ideas for future merchandise perhaps ? Maybe something for The Summer of FPGAs - Agenda
Seen on Amazon.com, made by ComputerGear.
I liked this one, but the paramedics cut it off me when I had a motorbike accident. 
I managed to get my expensive bike jacket off before the scissors came though.
I saw someone wearing this on a YouTube video recently and quite like it.
I thought the 70's artwork accompanying the The Summer of FPGAs - Agenda was awesome.
Or maybe a message. How about something like:
"FPGAs: don't worry, you can always adjust the design tomorrow".
"FPGA: just use 0 and 1...how difficult can it be"
Should be: "FPGAs : We'll fix it in hardware" 
