What flowers bloom at night? Are they all warm weather blooms or do any bloom in the cold weather? Any tips or advice about creating a moonlight garden (which is a garden with flowers that only bloom at night) is appreciated.

Datura metel & D. metelloides
Brugmansia ( a relative of above)
Eryngium 'Miss Wilmott's Ghost'
Moon Flower (Ipomea alba) a night-blooming morning glory
Any silver-leaved plants
Anything with white, or light yellow flowers

I can't think offhand of too many plants but what you want to do is look for white and fragrant.
One way to do this is to order abunch of catalogues ( and this is the perfect time for that as many companies are putting out their new catalogues for next year.

actually I forgot I had bookmarked a couple of sites a while back so will give those to yoou.

http://www.beginner-gardening.com/moonlightgardening.html

http://www.highcountrygardens.com/library/view/article/204/

http://www.theenterprisebulletin.com/ArticleDisplay.aspx?e=789592

http://www.gardenforever.com/pages/ArtEve.htm

also besides the plant don't forget about lighting. use some spot lihts and other lights to move yong.
An added benefit of the moonlight garden is that sometmes you get moths and if you are very lucky may even spot an owl in the distance.

enjoy your gardening

I recommend adding lots of white and silver in your garden. The plants that I know of are all warm weather plants - here are some that you should consider:

Datura meteloides - Devil's trumpet, blooms at night, flowers are white or lavender

Ipomoea alba - white moonflower vine

Stachys lanata - (lambs ears) - they have white fuzzy leaves that look silver. Makes a great accent plant

Cestrum nocturnum - (Night blooming Jesamine) - white blooms that are very fragrant

Matthiola bicornis - Night blooming stock - fragrant blooms in lavender,pink and white

Brassavola nodosa - Lady of the night orchid - white blooms that are very fragrant

Hope this helps. Good luck!

Make sure you include some Tuberoses and Honeysuckle. They make the garden smell wonderful at night. White Phlox will show up after dark and can be very fragrant depending on the variety.

Here are some common names for night bloomers. Missouri Primrose...looks like a dandelion until it opens at night and the bloom is beautiful, yellow, orchid like appearance. And there are Angel Trumpets...look like they sound...huge white trumpet blooms that just radiate at night. The blooms will not be dead in the morning like the Missouri Primrose. Then there is evening Primrose...a very tall, many branched plant with numerous small yellow blooms. The blooms will begin opening at dusk. Four o'clocks. These are bushy, tall, full plants of many colors. Just select the colors you want...purple, yellow, white, striped. They begin to open at four o'clock pm...what a surprise. These four flowers span all sizes and in a group would be great at night.