How are these to see on a dress?

They should be fine. The stones are sparkly and lightweight. They should be perfect for a dress except a very thin fabric like chiffon.

Can I straight pin them onto styrofoam?

No. The hole goes horizontally along the bottom of the stone. You could use wire however, push it through then bend the two ends down, then into the styrofoam.

ASIN	B08YNCFD2W
Amazon Bestseller	#287,751 in Hobbies ( See Top 100 in Hobbies ) #916 in Rhinestone Embellishments
Brand	TANOSII
Brand Name	TANOSII
Color	white
Customer Reviews	4.6 out of 5 stars 1,131 Your Review
Item Weight	0.08 Kilograms
Manufacturer	TANOSII
Material	Glass Silver Stone
Material Type	Glass Silver Stone
Number of Pieces	100
Shape	Oval
Unit Count	1 Count

TANOSII 100pcs Sew on Rhinestones Mix Shape Glass Rhinestone Crystal Gems Mental Flat Back Silver Claw Jewelry Crafts Clothes Shoes Costume Clothing White

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