You can use BlockEffects for a variety of things, but here are some creative uses:
โข Waterfall Mist
โข Volcano Smoke
โข Crate Animations
โข Falling Leaves On Trees
โข Biome Ambience
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A normal particle: /be create EXAMPLE SLIME
A normal particle spanning multiple blocks: /be create EXAMPLE HEART
Modifying the particle to span multiple blocks: /be modify EXAMPLE OFFSET 3 3 3 (Uses XYZ)
A particle that uses an item to display: /be create EXAMPLE ITEM_CRACKModifying the particle to show a specific item: /be modify EXAMPLE ITEM DIAMOND_BLOCK
A particle that uses a block to display: /be create EXAMPLE BLOCK_DUSTModifying the particle to show a specific block: /be modify EXAMPLE BLOCK DIAMOND_BLOCK
A particle that has a solid color: /be create EXAMPLE REDSTONE
Modifying the particles color: /be modify EXAMPLE COLOR 100 100 100 (Uses RGB Format)
A particle that has a transitioning color: /be create EXAMPLE DUST_COLOR_TRANSITION
Modifying the particles main color: /be modify EXAMPLE COLOR 100 100 100
Modifying the particles transition color: /be modify EXAMPLE COLORTRANSITION 200 200 200