Andrew Gale has developed a new, simple add-on board for the Raspberry Pi Model B+ that plugs into the GPIO pins. I think this is the first home-grown board I’ve seen for the B+.
It’s got a number of configurations (see below) and takes a variety of LEDs and switches to give you the board that you want.
He’s currently selling the kits on eBay for £5 each (including VAT and delivery). I’m getting a review sample sent to me so expect to see that in the next few days (possibly this weekend once it’s arrived).