I love out-of-shield DJC'ed aerials. Bairs are my favorites, and they don't always have to be DJC'ed either, a short-hop will do most of the time. I don't know why but I land this move on Samus players the most frequently
A word of caution: don't try jumping out of shield for a really close aerial attack against: Fox/Falco [their shine is quicker than anything you could do and they'll almost always follow up any aerial, which you would block, with an L-cancel-->shine, which you will eat if you jump out of shield for an attack] or Marth/Sheik, they can grab you out of the air extremely easily.
A better way to handle situations like that is to SH out of shield backward and then swing the second jump aerial right in their faces...great time for a fair
Another cool thing to do out of a shield is wavedash. If you're good at controlling how far your wavedash goes that can set you up for some sweet combos [meaning: if you know how to wavedash backward just a tiny bit, you'll be in perfect bat range]...either way, it can help you get out of being pressured by aggressive/top tier characters. it can also throw them off since most people don't WD out of shield [from what I've seen]...oh and btw, easiest way to WD out of shield is [if you use R to WD] hold L to block...and while you're still holding L, just WD using R [obviously switch the buttons if you use L to WD]
and obviously, WD-from-shield can also be effective if you WD forward...but it's only really practical if you play against someone who has a habit of rolling backwards if you block their aerial [Captain Falcon players will be the ones you see do this most frequently, though that doesn't mean CF users will do it a LOT...they just happen to be the ones I've seen do it the most]