Please locate the specs of 5 different LEDs on the one of the Digikey links. Each LED should be of a different color and manufacturer. Calculate what resistor using ohms law and a calculator would work for that LED. Please post to the blog. Include the manufacturer name and color.
sunLED 1497-1055-nd red 1.9V 10mA
resistor: 310 Ohms

lite-on inc. 160-1649-6-ND Blue 3.4 V 20 mA
resistor: 80 ohms

Rohm Semiconductor. 511-1651-2-ND Orange 1.9 V 1mA
resistor:3.1k Ohms

Panasonic electric components P14132TR-ND Green 1.95V 5mA
resistance: 610 ohms

Vishay Semiconductor Opto Division VLMW1300-GS08TR-ND Cool white 2.93V 5mA
resistor: 414 ohms