What are the best DIY cables you've heard?

Actually, a good ending point would be some Purist Dominus or Venustus. I have settled on Sonoran Plateau for the time being. They were the first affordable cable that I found that could beat my DIY. About $1400 for IC and speaker cables. That's not cheap, but they do sound better. But my DIY were only about $35 for both the IC's and the speaker cables.

My DIY recipe is what Lugnut described above.

Lugnut - Thanks for sharing the Twl recipe. I will try homebrewing it (am sourcing teflon tubing now :P ).
Twl - Thank you for your gracious acquiescence to Lugnut's post and sharing feedback.

Did you try experimenting with other guages, especially thinner wire? or with Ag rather than Cu?

Agonanon, I did not try thinner guages of wire, only the 30ga. I did not use silver wire because I don't have any high freq rolloff problems, and don't need any extra "zing" in my response. Silver wire always seems to be "hot" on the high freq.

I'm getting marvellous results from a pair of homebrew interconnects between DAC and amp following Greg Weaver's SST article. The IC I built uses copper magnet wire (0.02 mm^2/~34 AWG), 38mm wide tape (Tesa 4124 clear) with about 30mm spacing between the parallel wires. Using narrower tape than what the original recipe prescribes may be a step in the right direction toward getting an elegant termination - the only difficulty with this design. I would love to hear from anyone who was pleased with flatline / ribbon / tape cable cooking or found, comparatively, other geometries significantly better.

SST recipe http://www.soundstage.com/synergize/synergize021998.htm

mm^2 : AWG
http://www.oilfield.de/download/techtabs/electric/cable001.pdf