A classical photowall would look something like this:
1. You still need a big wooden plate to work your magic on, but instead of the vintage tapestry you can either choose a more contemporary-looking pattern like this red one, that bears resemblance to the fabric used in Mary of Hapsburg's dress, the green detail:
or you can paint a castle wall on the wood inspired by photos such as this:
|This tall and slightly pointed window is from the ruin|
of Kerelaw (1488)
3. To finish it up you might want to get toy swords, shields and helmets, or maybe a rose a mirror or a very long wig. Just small geeky accessories to play with and to make the photos really funny.
The end result could look something like this, without all the extra accessories:
Personally we were VERY lucky that the venue already had a photowall. It's a bit more cartoony and fitting for a carnival, but I adore it. And if you are a bit artistic, you might want to try painting something like it yourself. I considered it. But it's quite a project to take on and if you aren't happy with the end result it's a lot of work wasted.