Yes you can make nice looking ¼ fold cards right from your own printer.
 

 
The downside is those packages of paper with the matching funny sized 
envelopes, and the purchase of inkjet cartridges, and the purchase of 
desktop publishing software, consumes the savings realized by not 
actually purchasing greeting cards in the store.
   
As you've undoubtedly seen throughout other pages in this site, we've covered 
the image and card issues pretty well, and will continue to update our material. 
Now let's tackle the envelope issue, and save some money.

Step 1
This outline show proper card placement 
to begin making an envelope. The card will 
be directly in the center, side way when the 
paper is viewed in its' normal position.

Here is another view, the card is in the normal 
position, The sheet of paper is now sideways. 
You don't have to draw an outline.

Step 2
The first two folds will be on the long sides 
(11") of the paper, fold them so the card has 
just a little bit of room on each side.

Step 3
Using medium pressure, use a clean, hard 
object, to go over and crease the folds, on 
a hard clean surface. The side of this marker 
and the wooden table top in the photo work 
very well for this purpose.

Step 4
The next fold will make the bottom of the 
envelope or the "pouch"

Step 5
This fold will make the top of the 
envelope or the "flap"

Step 6
Ordinary transparent tape will 
seal up the envelope just fine.
 

Step 7
Address your envelope, add a stamp, 
and you're done.