if using two pentatonic scales a semitone apart is allowed, I might give it a try

Since I discovered it, I've been a big fan of the double harmonic scale, a.k.a. Arabic or Byzantine scale.

C Db E F G Ab B C

It can sound quite exotic (to someone raised on Western music) and lends itself to tritones and diminished chords quite a bit so can sound pretty dark.

I find it useful to flatten the seventh from time to time, turning it into the Phrygian dominant:

C Db E F G Ab Bb C

i use all sharps, starting at any point in the scale as a home note.

eg a+ b+ c+ d+ e+ f+ g+ (+=sharp)

There is no such thing as a b#

There is no such thing as a b#

There is no such thing as a b#

There is no such thing as a b#

you even have F##, but I don't remember how you should write that

Use scales for experimenting with music but don't "try" to create something from a scale.
That's a road block.

I learned this
http://documentation.apple.com/en/logicpro/usermanual/#chapt er=36%26section=0

Created Environment Macros for all the scales here
http://www.dolmetsch.com/pianochords.htm

and now do this to experiment with scales
http://www.youtube.com/watch?v=0Os0b1seX1g

I also have this
http://www.thumbjam.com/

and with all the scales from the above scale web site (dolmetsch) I created a scale file that I loaded in ThumbJam and now after I create something cool in Logic using my customized Environment Macros, I can improv using ThumbJam with the scale I was using in my Logic project or experiment with ThumbJam by switching scales to see if a different scale sounds cool against the scale in my Logic project.

And yes, I can record all this into Logic as well.