DH has some really old prints that are quite sentimental to him. We're re doing our hall way and I'd really like to get these prints framed, but I really can't afford bespoke ones. Anyone got any ideas? For info they are like old posters, I've listed some of the sizes below. The o my idea I can think of, I buying a standard size frame that is too big (but the poster will fit in) and have like a white border around the edge where it's too big.
Sizes are (in mm)
595 x 420
230 x 700 (so long and thin)
One of them I've just realised is A3 size so that's fine. But any ideas for the others?