For me it would be
Jonesi's BlanketPP's Modern Georgian Manor Set, and the 'add ons'.
I've run out of 'link inclination' now...
err... BB's Basic Kitchen and Clutter - MTS2
Simaddict99's Bed Scarves and Maxis Match Nurseries - TSR
Marvines Spiral Stairs and Ladders - MTS2
Everything from Holysimoly
Everything from Sims2Play, especially the paintings and rugs.
Nengi65's rugs, especially the deep pile ones and some her old crumbling walls - Sims Crossing
Anything plant like by Macarossi - MTS2
I could go on, but I have a life somewhere. I think I left it under the garden bench.