Virtual candles are as the name implies candles that are animated graphics, photos, etc.. used to repesent real candles. Just googling virtual candle will pull up many results ranging from YouTube videos to phone apps. There are many sites boasting virtual candles I'm sure you could find one that fits your needs.
I found a virtual fire: http://magic-spells-and-
Virtual candle where you pick a candle color and post a corresponding message or spell: http://www.witchschool.com/page/virtual-candles
yea that's what i thought, just never heard of people using them for anything beyond decorations for a site is all. personally, i'd just use real candles, but if you feel virtual is better, go for it, i don't know of any sites myself, but i'm sure a quick google search will reap some results.
The only reason I can see someone using virtual candles as one recent post comments on is hiding the fact you practice magick from your family. Lighting a bunch of candles can be conspicuous especially if your a guy. Virtual candles if they're truly virtual would move but most I've seen don't though the main google results are YouTube videos of real candles.