We recently had some upstairs blinds replaced as the plastic pieces in the old header had disintegrated. The big surprise with the new blinds (shown below) is this design has no strings. You just lift up on the bottom rail and the blind goes up. You pull down on the bottom rail (with slightly more force) and the blind comes down. The wand works as always, twisting one way or the other to open or close the slats.
I like it when a product gets safer and better at the same time. The link to the company that came out, measured, gave us options, and installed the blinds is below.