I found this great website the other day when I was looking for some ribbon. It is called Izzjack Crafts and you can find it at http://www.izzjack-crafts.co.uk
Izzjack Crafts are a UK based online craft store who sell card making and scrapbook supplies, consisting of paper and card, ribbon, stickers and embellishments to name but a few.
They have a January Sale on at the moment with 20% off. Their Valentines section is a must for you to look at for making your own Valentines Day cards. This "Be My Valentine" white banner with red or gold foil is perfect for a Valentines Day card. It measures approximately 24mm x 90mm and is foil printed in red (or gold) on to quality white card.
This would look great on some "Dovecraft Ruby Red Glittered Card" which is on sale at £1.20 for 2 sheets. The cards are A4 size and are loaded with brightly sparkling glitter to give a dense cover and a brilliant shine. These red cards are also good for making your own Christmas Cards.
There is also an "Ideas Gallery" giving help and inspiration on how to make your own cards which you can find here at http://www.izzjack-crafts.co.uk/card_making_ideas.html
All in all this is a great website to visit.