Simple idea. Use two adjacent arpeggios of the scale you want to be playing. (This is valid for all 7 note scales).
For example let's use the triads on the first and second scale degrees.
The first scale degree triad will give you the:
1st, 3rd and 5th
The second scale degree triad will give you the:
2nd, 4th and 6th
So, you see, if you play these two triads you are already playing all the scale tones except for the 7th.
Try it improvise with two adjacent triads!!
Now let's do the same with 7th arpeggios:
The first scale degree arpeggio will give you the:
1st, 3rd, 5th and 7th
The second scale degree arpeggio will give you the:
2nd, 4th, 6th and 8th
So this time you are using all the scale tones.
Again try improvising using two adjacent 7th arpeggios.
Here's a video showing and explaining the concept: