re: I am loathe to speculate on raw images... BUT here goes
Hi, R.L.:
There could be dry glacial movement going on. It could also explain the lack of impact craters in the 'plains'.
The ice boulders we've seen could be what geologists call kettles. They do seem to have settled in groups.
As to the grainy surface the blocks/boulders are on, I like Tom's thoughs on that here. There may (still) be fluids underneath that all.
As you know, I'm no geologist either. Titan has just been unveiled for all of us to see.