In reply to pasbury:
IMHO, you're looking in the wrong place. While there's loads of proper climbing, there's virtually no scrambling in the accepted sense of the word on the Aran mountains. Basically, there's an absence of easy angled rock and no rocky ridges or friendly angled buttresses. There are, however, a number of quite small discontinuous outcrops on the hillside above and behind Bryn Hafod in Cwm Cywarch. From experience, you can definitely scramble up these, with sections of steep walking in between, but that's about it AFAIK.
In contrast to northern Snowdonia, there's very little 'proper' scrambling between the Afon Dwyryd and Afon Mawddach. There's one reasonably good scramble on Cadair Idris
Tapia Llwydion (Grade-3) and there's also some limited stuff on both Rhinog Fawr and Rhinog Fach's south faces, but that's about it.
Sorry to be so negative.
Dave