Frequent readers of this blog/solvers of my puzzles in general may notice that I tend to use a "squares" theme a lot. (Just take a look at my favorites list.) This theme is just so incredibly versatile: squares that are "L-shaped" moves away from each other have strong interactions in a lot of genres. Of course, this clue layout is a bit restrictive some times, but it's cool enough that I use it as my go-to theme whenever I'm too stressed out to come up with an original theme myself.
On a completely unrelated note, here's a Bosnian Road puzzle.
Shade some cells to form a non-intersecting loop which does not touch itself, not even diagonally. Clues cannot be shaded, and represent the number of shaded cells in the (up to) eight cells surrounding the clue.