The chord progression is simple: G, C, D. Maybe too simple. I found it really hard to hang any kind of interesting idea onto this. Also, I was slightly put off by the fact that the obvious - no, the cliched - sound over this is a smooth overdrive, which is what I expected everyone else to use, and I know there are people who are much better at that kind of playing than me. The main thing I can do is use my imagination to come up with something slightly different.
Since this is in G, I normally think in Em, in terms of shapes on the fretboard anyway. This also means that quite a few of the harmonics at the 12th, 7th and 5th frets will be valid notes in that scale. It turned out that the smooth overdriven sound (EXH Soul Food on max boost into the Tech 21 Double Drive running on full "class A" gain, and the MXR Carbon Copy providing some subtle delay) made the harmonics sound pretty epic, so that gave me a good intro. Then a simple repeated riff using basic notes from the chords did the rest.
I don't think it's particularly inspired but then, if I'm honest, I don't think the backing track is either. Apparently it's the middle eight from an existing full track, with the vocal and solo stripped out, and I think some of that context would have helped inform the solo. Anyway, here's what I ended up with.