Here's another guitar riff for you, this one taken from the E pentatonic minor scale in the open position.
If you're having trouble with the stretch, you might want to check that your guitar is setup correctly, or use an electric guitar instead.
Other than that, this riff is pretty basic in its use of the pentatonic scale... just a few hammer ons and pull offs. It isn't the complexity of a riff that makes it interesting, it is the arrangement of notes, and that's a key thing to keep in mind when you're working on your own material.
Speaking of keys... this riff will work well in G major, E minor, or an E 'blues' key with a progression like E7 A7 B7. Experiment with it. Have some fun.
So without further ado, let's dive right into it!
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If you need a touch up on your guitar scales, then I recommend checking out my course on Guitar Scale Patterns, as it digs into that topic in detail, and will be sure to get you on the right track!