I know not all strictly "Sci-fi" , but
back to the original question - someone said the word "spawn" and made me think of the old HBO animated McFarlane series which was waaay cooler than than the PG-13 bull**** movie they made- you could try that, but it may be difficult to find. Along that animated vein too are some others: Aeon FLux (and the movie weren't too bad for that one, either), The Maxx
Since I don't know what you've seen, I'll just tell you what I liked, since I tend to do the same thing - that genre is great company while doing other things because its fun and fluff-y and sometimes smart too.: I like "Sanctuary" quite a bit, and because of that Netflix has suggested I check out "Castle" as well, but its not streaming yet, so I have to do the DVD to see if I like it. Among my likes for series are "Farscape" which I liked much better than "Lexx" (though it will work for killing time and tons of innuendo and just plain oddness if you are in the mood for that. I found "Lexx"by watching TVUPlayer channel CBNS on the net - they run some interesting stuff from time to time too). "Angel "and "Buffy", of course, for more Joss Whedon fun there's the brief but entertaining "Dr. Horrible's Sing Along Blog".
"Supernatural" has some seasons I'm catching up on now as I stopped having the time to watch "Smallville" despite Rosenbaum's awesome Lex Luthor portrayal. "Andromeda" was alright-ish if you can get over Sorbo in a different space. Gonna check out "Eureka" "Fringe" "Primeval" and "Warehouse 13" soon too, but don't know what to expect there. "True Blood" is a guilty pleasure of mine that was absurdly addicting from the first minute for me, too. And the standard Treks if you haven't seen em - I never got into DS9 myself, but I liked Voyager and LOVED TNG enough that I'm thinking it may be time to revisit and give DS9 another shot. Stargate is ok, but not as engrossing for me as some of the others I've mentioned, and Quantum Leap is fun too.
Any new ideas in those or have you already been there, done that?