A few crudités ideas to chew on (sorry for that) I could talk at length about building the perfect dip on the fly (and one day I definitely will) but for now these are some dipper-centric tips for your next plate o' produce:
1) if it has some cute greens, leave them on Did you buy some little carrots or radishes with the tops still intact? Leave them (or a trimmed-down part of them) be! I like to let the radish greens drape over the side of the platter. It will look whimsical and unfussy, like The Secret Garden of crudités. You can remove any less fresh looking leaves - not every piece has to have them attached. If needed, you can put a little plate out for discarded greens as you would for olive pits (though they are mostly edible!).
2) mostly vegetables, but with a wildcard I often reserve one slot on my platter for something less vegetal - dip-sized pieces of grilled bread, sturdy potato chips, Ritz crackers or even boiled teensy potatoes or halved eggs. It can be as fancy or low-brow (I did once add tater tots to an otherwise sophisticated crudités plate) as you like, but the point is to add another texture and flavor profile to the mix!
3) go beyond the cliche Think spears of fennel or endive, leaves of small tender lettuces, colorful radish varietals, baby vegetables - if you like it in a salad and it can be cut in a dippable way, it will do the job nicely alongside your carrots and celery.
4) pick a color palette Admittedly this is my least-used tip, only because I have a tendency to buy produce in an unplanned, emotionally-charged way. But if you do use a palette, it can lead to some truly gorgeous platters. I reserve this for when I'm making a particularly striking dip and I really want to show off. Here are a couple coordinated combo examples: