Without picks it didn't happen. Without a rope it doesn't count.
Well anyway,
I did some Ddrt climbing(on a rope).
I tied into my saddle with a double fisherman's and tied a blakes with the tail.
I didn't have a pulley to advance my knot, so I placed a klemheist on my up rope and hooked it into a biner which I place under my knot, then I used my double foot loop the same way I do when climbing SRT. That worked pretty good, it was easy to move up, and the biner advanced the knot real well.
Only thing I didn't like about it is that I wasn't getting as much return for my effort as I would have like too, but did manage to climb to around 35' or 40' that way.
All in all it didn't take that much longer to get up there, it did force me to use muscles that I don't normally use that much when climbing, but I think it's a good way to climb.
One thing I really liked about it is the fact that I feel a lot more sucure climbing on a double line, there's not any bounce like there is on a long SRT climb, plus having two lines connected to me, and knowing there is only half the force on the TIP(I usually climb SRT, which puts twice the force on the tip as DdRT) makes me feel pretty good about it.
One problem I noticed is that you have to make sure there are no branches inside your loop, else you'll have to tie in with a lanyard and move your climbing loop across the branch.
Not much trouble on a big spread out tree, but on a tree with a lot of limbs I think it would be a real PITA.