See Puzzle 4 for instructions. At first I left the numbers just inside the upper corners out - I didn't seem to need them in making the puzzle. I thought about putting them in anyway to make the grid multisymmetrical, but then I figured "nah, why make the puzzle easier". Then I discovered a very good reason to make the puzzle easier: multiple solutions! Oops. Note to self: test puzzle first, then post to LiveJournal. Shame on me. Okay, this one has a unique solution, and is much more aesthetically pleasing to boot. Enjoy - it's only a seven-by-seven grid, so how hard can it be, right? ...Right?!?
As usual, comment about the puzzle here, and email me the solution when you find it. - ZM