This is the pentatonic minor scale. It sounds great over the 12 bar blues in G. It also sounds great over other music in the key of G. The notes that are red are all G. You should record your self playing the 12 bar blues in G and then practice soloing over the chords using this scale played at the 3rd fret. Try ending... on a red note. It seems to resolve well. You don't always have to end a phrase that way, but its a good place to start. Just build little phrases of two or three notes ending on a red note. Branch out from there. If I get time I will upload a 12 bar blues in G for you to practice with.