Random encouraging thoughts of the day:
1. It's always harder to play other people's music - yours may also look hard to others!
2. Tabs and notation make everything look twice as hard as it really is - there are always a million tiny rests and grace notes, when the key notes often aren't that hard.
3. Start with your simple riff and then play repeatedly. Each day you can experiment with a few nuances - different picking, a bend or two, hammers on or off, leading notes, chromatic transitions (booyaka!), different rhythms, octaves, double stops, basically whatever sounds good to you (or maybe none of the above and just add a distortion pedal). A few of the things usually stick and you can end up with something unique.
4. Echoing what others have said, nothing wrong with simple. My two last songs featured an intro and the main part of a guitar solo which were basically just scale runs (played with feeling!). I don't think anyone really noticed or cared...
5. Go see Paulski's latest Country / Pop formula post in the Bar!
6. Don't be discouraged!