Theme: Friendly Diagonal
Range: 1-8
This is a Panoramic Skyscrapers puzzle. Standard Skyscrapers rules, except that clues are given between two rows or columns. These clues give the sum of the Skyscrapers clues of the two rows/columns they border.
I first saw this variation on the 2016 USPC written by Michael Rios; I'm unsure if it has been done elsewhere.
Theme: Clue Symmetry
This is an All Threes Slitherlink puzzle. Rules (from Palmer Mebane's blog): This is a Slitherlink puzzle, with a twist. Every 3 in the puzzle is given to you. That is, if the solution has three segments around a single grid square, there is a 3 in that square.