Blue smoke is an indication that your engine is burning oil...if it was running rich, the smoke would be black.
Does the smoke go away completely once the vehicle is running warm? Hopefully, it does.
By the sound of your situation (not changing oil and running dry), some damage has been done to the seals and probably piston rings from the lack of lubrication.
You may be able to "help" the situation by using a thicker, high-mileage oil...something like valvoline high-mileage 10W-40, or 20w-50. The thicker oil will help reduce the oil seepage into the combustion chamber, and the high-mileage additives that are put in these type of oils will help to extend the life and function of other seals that may have been compromised during the low-lubrication period.
You are probably using the factory-recommended 5W-whatever, which means that the oil is "thinner" at cool (start-up) temperatures, allowing it to slip past the damaged seals more easily when you fire it up...then as it heats, the oil approaches its "thicker" state and can't get into the chamber as easily, which is why the smoke goes away.
As an additional recovery and prevention step, I would definitely have a look at EVERY spark plug to check for additional signs of damage or wear...then replace them.
'08 Highlander Sport, Magnetic Grey 2WD, options - Wife's ride
'04 Solara SLE V6 coupe, Lunar Mist Metallic: Wife's old ride..now mine
... TRD springs, 18" wheels, TRD exhaust, Intake w/ MAF mod.
Last edited by dixon422; 03-01-2010 at 12:34 PM.