If you like colors,buy this theme
Odoo + AdminLTE + LOVE = CooLTEve
Odoo 10 Fabric Theme
Customizable Backend Theme Based on Material Design
If you a bored,try this theme
If want more space, use this theme
If you like blue,try this backend theme
Odoo 10.0 community backend theme
One of the best backend theme available for Odoo with extensive change in look & feel