I was thinking about what scale would fit over A/C besides the half step/whole step scale and I came up with this

C-Db-E-F-Ab-A-C

The scale is combination of half step and minor 3rds

Is there a name for a scale like this? It sounds vaguely familiar...

howabout these ones?

C-E-F-G-Bb-C

This Sounds very indian..I know this works very well on C7sus chord.

C-Db-E-F-G-Ab-B-C

Is this the double harmonic minor? I guess you can use this on Cmaj7 #5b9, if you ever come across a chord like that.. but other than that, i dont know how this scale can be used in context.

C-Db-E-F-G-Ab-B-C
Is a common Indian scale, one of many. I call it the "snake charmer's scale".

C-E-F-G-Bb-C is another Indian type scale and was popular with the jazz fusion players like The Mahavishnu Orchestra, etc. I call it the fusion scale. The fist part of tye melody on "Within You, Without You" on The Beatles's Sgt. Pepper album uses it.

The first scale is very very interesting.

Some of these scales are so exotic and harmonically ambiguous that really jumbles my mind. Of course, trying to categorize these scales into the Western harmonics is a pretty futile effort, as most Eastern music is aharmonic in nature.

I've heard the first one referred to as the "Augmented Scale", I think- though it's possible the order of half-steps and m3's was reversed.

The third one C-Db-E-F-G-Ab-B-C ... I had a classical teacher, slightly crazy and brilliant, who related that scale to one of those weird classical 6 chords... Neopolitan 6, German 6, etc... I can't remember which is which. It does generate some crazy chords, though.
Like the vii chord and the V chord-- What do you call those doubly-minor thirds? Double minor thirds? Diminished thirds?

In practical useage, I sometimes use it interchangeably with "Spanish Phrygian" C Db E F G Ab Bb C, even if the chord is dominant (though not if I want it to function strongly as a V chord).
Kind of like the first two bars of "La cumparsita", over a C7 chord: | C Bb G E | C Db C B C |

I love its symmetry around the root-- you can go up and down identical intervals.

C,Db,E,F,G,Ab,B,C hungarian gypsie scale, starting on F. Or double harmonic scale, arabic scale, byzantine scale. Lots of names.

The augmented scale is really great over many chord types, probably most useful over a major 7 sharp 5 though.