Blue + Brown = Purple
Blue
#0000ff
#0000ff
Brown
#964b00
#964b00
Purple
#4b2680
This is the optical complement calculated as the average of the two hex codes.#4b2680
Navy Blue + Dark Brown = Abyss Blue
Navy Blue
#000080
#000080
Dark Brown
#331800
#331800
Abyss Blue
#1a0c40
Abyss blue above does look slightly brownish somehow. This is potentially an impossible color. #1a0c40
Neon Blue + Desert Sand = Aqua Green
Neon Blue
#01d5ff
#01d5ff
Desert Sand
#edc9af
#edc9af
Aqua Green
#77cfd7
#77cfd7
Dark Blue + Buff = Light Plum
Dark Blue
#00008b
#00008b
Buff
#daa06d
#daa06d
Light Plum
#6d507c
#6d507c
Cloud Blue + Beige = Light Sand
Cloud Blue
#f7fcff
#f7fcff
Beige
#e3dbbc
#e3dbbc
Light Sand
#edecde
Above the beige kinda dominated because cloud blue is almost white.#edecde
Ultramarine + Chocolate = Medium Purple
Ultramarine
#4000ff
#4000ff
Chocolate
#7b3f00
#7b3f00
Medium Purple
#5e2080
#5e2080
Very Dark Blue + Wenge = Dull Navy
Very Dark Blue
#002e63
#002e63
Wenge
#645452
#645452
Dull Navy
#32415b
As a general theme, impressive blues mixed with equally impressive browns tend to product uninspiring purples.In summary: blue+brown produces purple, green, brown or blue and bluish browns don't really exist because blue is essentially the opposite of brown.Next read: Complementary Colors#32415b