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
LED Strip 5060 RGB Bare (1 metro) - COM-12021 - Gizmojo
LED Mixed Bag - 10mm - COM-11459 - SparkFun Electronics
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LED Mixed Bag - 10mm
Diffused LED - Red 10mm - COM-10632 - SparkFun Electronics
COM-11453 SparkFun Electronics, Optoelectronics
LED - 5mm Cycling RGB (fast) - COM-11451 - SparkFun Electronics
RGB Products - SparkFun Electronics
Gikfun LEDs Diffused RGB Common Anode 4 Pins 10mm Super Bright Bulb La
Diffused LED - Yellow 10mm - COM-10634 - SparkFun Electronics
Gikfun LEDs Diffused RGB Common Anode 4 Pins 10mm Super Bright Bulb La
RGB Products - SparkFun Electronics