I am a recent convert to different textures but I still love the look of default. The pack I usually use is called Faithful 32: Faithful 32x32 Pack [UPDATE:X-MAS CHESTS!] (1.4.6) - Minecraft Forum
It's basically the same textures, but re-done and original work in double the standard resolution.
I also make/use my own with Faithful as the base, the beauty of MC is that any textures, texture packs can be put through an image editor of your choice and customised in any way you want, spiders too scary? Put on a Christopher Walken face. Zombies looking mean? Give 'em a smile! It's all possible with a little time, most texture pack makers give permission to use and customise their work so long as you don't claim it as your own or try to distribute or make any money from it..
Currently on Frontier and singleplayer I use Faithful 32 with the moon, sun and a few plants from Glimmar's.
I like the look of default, but also like some of the detail the other packs offer so a mix and match is what I usually go for