There are bookmarks available on the website for LOADS of countries! These have the Bulgarian flag. You can colour them yourself or print the colour version.
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.