Solid Vs. Outline Icons: Which Are Faster to Recognize?
Master's Paper | Filled-in vs. Outline Icons: The Impact of Icon Style on Usability
Solid vs. Outline Icons: Which Are Faster to Recognize?
gui design - Can solid and hollow icons be used together? - User Experience Stack Exchange
UI cheat sheet: Icon categories + icon style reference guide | by Tess Gadd | UX Collective
Free customizable 3D icons | Vertex.im
Handcrafted 3D icons. Customize it online - change color, material and choose right angle. 100% free.
Drawicons | Thankyou
Download Drawicons for free now and get over 200 hand drawn vector icons to spice up your design projects and creative work.
10 iconography rules to follow in UI design
Check out these icon design tips & best practices before implementing them in your next UI design.