I no-chill every brew, so making starters from the same wort as the brew is a regular occurrence for me. BUT - I always dilute the wort down to around 1.040. I want healthy yeast and think that the gravity of the starter is important for that.
Best of both worlds, you get the same flavour profile in your starter as in the brew... but you get good healthy yeast growth too.
I usually take the gunge thats left over in my kettle, hops, break etc - filter it through a dishcloth in a big funnel. Dilute it and then give the resulting clear wort a quick re-boil in the Erlenmeyer I am going to do my starter in.
I usually don't need all the wort I get from filtering my trub, so if its a light coloured brew, I freeze it and use it on those occasions when I cant be tossed mucking about with filtering the current brew.
I haven't made a starter out of DME in ages.



