Meet Paint-By-Numbers wallpaper. I love this – particularly for a single wall or small space – and especially love that you can tailor the colors to your exact specifications.
Reader Naava, who sent on the link, suggested hanging the wallpaper and then getting a group of friends together with some wine and setting them free with colored pencils. While I may advise skipping the wine part – the last thing I need is JOHNNY WUZ HURRRR scribbled on my walls – I think this is an adorable idea for a party (especially a baby shower: all your guests can contribute to the nursery decor!).