Here's my take on the best progressions to get a modal sound (note: the progressions are very simple, and sound crap on their own, but they provide the best platform for you to try your modal scales over, to really hear how these work). Modes on really come to live when you play the scale over the correct chord sequence.
C///F///F///C/// : C Ionian Scale
Dm///G/// : D Dorian Scale
Em///F/// : E Phrygian Scale
F///G/// : F lydian Scale
G///F/// : G mixolydian Scale
Am///Em/// : A Aeolian Scale
Bdim///??? : Locrian Scale (Very hard to get a good Chord progression) perhaps someone has one to contribute....
Now if you apply Roman numerals to your C Major Scale chords,