For beats, I'd recommend getting some breaks. It's a bit cheap, but mixing them into your beat (like the one Icky used) is a really easy way of getting that drum and bass beat sound. There's a few decent free packs of them going around, I've particularly enjoyed the use of this one:
http://www.musicradar.com/news/tech/sam ... les-335840Random stuff I've found sounds nice:
Automating the pitch on a break can sound really good, especially during the build-up stage (not sure what to call it) before the 'proper' dnb part of the track. I'm pretty sure I've heard Princess Addictia use it before in his Hush Now remix. It's where I got the idea from.
And yeah, reese basses are awesome. I've found sidechaining it to a kick is a really good way of making it more interesting. Also, fiddle with the pitch envelope for some really cool sounding stuff.
EDIT: Oh, and if you need an example of a reese bass (Not sure how much you've done with dnb, you probably already know how to make one, but whatever), here's one I made in 3x Osc:
http://www.mediafire.com/?ggcnj5mcn5ztzn6Pretty average, it still needs effects and whatever, but you can see the detuned saw waves at work quite well.
Also note, I don't claim to know much about music creation, I'm just sharing what I've found useful. I could be spouting rubbish for all I know.