Nothing-saying
as a sentence ending particle gives a bit of a "y'know" vibe.
「タッタッタ」って車に乗ってみたいな。 I really want a car that goes like 'tatata', y'know?
Wonder
denotes being hopeful, wondering if something will happen.
明日は晴れるかなあ I wonder, will the weather clear up tomorrow?
すごいなぁ That's amazing!