Check out these big 10mm common cathode through-hole LEDs! The opaque epoxy package causes these LEDs to have a soft, diffuse glow.
LED - RGB Addressable, PTH, 5mm Diffused (5 Pack) - COM-12986 - SparkFun Electronics
Diffused LED - Blue 10mm - COM-11161 - SparkFun Electronics
Diffused LED - Yellow 10mm - COM-10634 - SparkFun Electronics
Diffused LED - RGB 10mm - COM-11120 - SparkFun Electronics
Diffused LED - RGB 10mm - COM-11120 - SparkFun Electronics
Diffused LED - Blue 10mm - COM-10635 - SparkFun Electronics
LED - RGB Diffused Common Anode - COM-10821 - SparkFun Electronics
Diffused LED - RGB 10mm - COM-11120 - SparkFun Electronics
Gikfun LEDs Diffused RGB Common Anode 4 Pins 10mm Super Bright Bulb La
LEDs and Illumination - SparkFun Electronics
LED Holder - 10mm (Chrome Finish) - COM-11148 - SparkFun Electronics