If you're going to go Paleo I find it helps a LOT to approach it from what I CAN/SHOULD be eating instead of what I should be avoiding. So....meat, vegetables, fruits, nuts & seeds (sprouted), healthy fats. The reason grains and legumes are avoided is primarily because they're relatively empty carbs and because the phytates makes them hard to digest, and if you have a compromised gut it's even harder on your gut lining. Grains are also really not that terribly nutrient-dense, especially compared to meat and veg/fruit. Here's an article about the grains:
http://www.marksdailyapple.com/why-grains-are-unhealthy/#axzz38FawMebj, and here's a note from the same blog on legumes:
http://www.marksdailyapple.com/beans-legumes-carbs/#axzz38FbpgVzuSo, with that in mind, snacks for us might just be small meals, portions of leftovers. They might be small bowls of soup. They might be hard-cooked eggs (maybe devilled eggs!) or a quick scramble. They might be avocadoes (AWESOME snack for little - just cut in half and serve with a spoon!), or they might be carrots dipped in sour cream, or diced and cooked till just soft in butter. Little chunks of meat dipped in sour cream or yogurt works. A salad with meat and/or hard-cooked egg as a garnish, with some olive oil dressing - yum! A little Googling will find you crazy healthy Paleo snack recipes; I have a vague recollection of one with coconut oil and cocoa powder and almond butter. If we have fruit, we try to have it with a small serving of good fats like sour cream or full-fat yogurt. Hard-core Paleo tends to avoid most dairy, but we can handle yogurt OK here; I make a gallon or so weekly.
I'm allergic to almonds so I don't use almond flour, but I do use coconut flour from time to time - LOVE it.
I don't really bake, but I have used it for "breading" chicken and fish nuggets and I sometimes add some to an egg bake for texture.
If you're worried about fiber, as long as you're getting plenty of vegetables, you're getting plenty of fiber. Seriously, the fiber content of broccoli? Lettuce? Carrots? Cabbage? More than enough.
Oh, do note: corn is a grain, not a "vegetable."
Have you seen the Paleo Parents website? They live near me (haven't met them yet, but love the blog!) and have 3 boys and lots of ideas!
http://paleoparents.com/ Might be a good starting place!
Good luck!