Picture searches (where a person is given the image of something hidden in a bigger picture) can be a whole lot of fun for children. They are intellectually challenging for all ages and there are a huge variety of images out there to play with. Doing a search of Free Printable Hidden Picture should net you many options, but here are a few links. This first page has a list of 15 printable worksheets. They are can do double duty as coloring pages too!
This second site is an interactive web site, so if you are comfortable letting your children sit and play games on the computer, this might be a fun game for them.
This second site is an interactive web site, so if you are comfortable letting your children sit and play games on the computer, this might be a fun game for them.