Here's a set of printable bookmarks featuring the Polish flag in four variations - some to colour in, some to write your own messages on.
Poland Flag Bookmarks
Our Turkey bookmarks would also make handy classroom labels and come in 4 versions; with or without country name, colour or black and white.
We have four variations of this St David's flag bookmark printable including 2 in colour and 2 in black in white for the kids to colour in. The blank bookmarks make useful labels, too.