I got a couple of simple frames in Target that were the right size for the wall I wanted to hang them.
You also need some kind of embellishment as decoration, shops like Spotlight or Lincraft will have stickers for scrapbooking or you can look online for something fun. I was given a gift bag with a present for the Bean that had really cute little men on it, four of them had glitter on them so I used two of them for our artwork!