As good as the scrambling on Tryfan/Bristly is, it's just too busy for my liking. Too much choice to pick. Ledge Route stands out for providing a relatively easy way through improbable terrain, and something on Skye should be included - NW Ridge of Bruach na Frith is good (grade 2 in the book, but overgraded I think).
I'd also second Mr Wick's choice of gill scrambles (though of course not restricted to the Lake District). Getting off the beaten track and finding new gorges and gills is a great way to add some uncertainty and adventure into the day.
I suggest a walk out to Rubha Hunish; the northern point of the island. It's a short walk across, then a brief, easy scramble down through the cliffs gains the headland. Fantastic spot - last time I was there there were porpoises, basking sharks, and all sorts of sea birds.
No, it's not a steep walk from PyG at all. The path (Miners' Path) is at a friendly gradient and rocky, until it meets the plateau where grass takes over until you reach the lake. The Cefn y Capel approach is longer and much boggier, but takes in a couple of summits on the way.