I bought the Rasch Parrots Wallpaper from B&M Bargains (£8.99 a roll), while the orange frames and tins came from Tiger. There's also a pretty Russian Khokhloma cup I found on eBay and D.I.Mdoll Gayane.
The strips themselves are really easy to use. You press the two halves together until they click (and they really do click), then peel off the backs and stick one side to the frames. Once they're well and truly stuck in place, peel off the backs of the other sides and stick them (plus frame) to the wall.
I used a pack of large strips (£3.80 on eBay including postage) and I must admit I was a little sceptical. But... they adhered a big 24" by 36" frame with perspex front (£16 from khaksar11 on eBay) to the wall without any problem. For once a product that actually lives up to its hype - I'm impressed! :)
Edit - 11/11/15. I'm linking this up to HomeEtc and can confirm the frame is still up with no problems whatsoever. :)