Eggs belong to??

Here's my first birdnest of the year. It took it around 3 days to lay all for eggs.
What kind of bird is it?

I would keep your eye's open to see who visits the nest...my only guess would be House Sparrow...but that is strictly a guess.

The eggs are very pale and unmarked for house sparrow (according to A Field Guide to the Nests, Eggs and Nestlings of North American Birds, Colin Harrison). Also house sparrow nests are usually domed (though they may be cup-like if built inside of a hole - from same reference and from observation).

Here's the first 2 eggs