I'm interested to know, too. I start my gumpaste flowers class tomorrow night. woot woot!
i have a general leaf veiner, and as far as im concerned, that will do all my leaves! im not too worried about absolute accuracy, if theres a few lines, that will do me. i know a lot of people have bother getting a veiner to match the cutter, then trying to get your leaf on the right lines.
flower veiners i havent bothered with, im using a dresden tool (and a pallet knife before i had that) for the lines there are, but then again the ones ive done dont have much in the way of veining.
so basically, comes down to how bothered your are about realism, and what flowers you are actually doing.
xx
I have the Wilton gum paste flower kit that has one in it and FMM set #2, (i think). That's all I use and works for me. It's very expensive to order lots of different ones and I will probably eventually add more as time goes on, but for now these are plenty!
Sorry, y'all, but I'm stumped -- what's a dresden tool? 
TIA!
Marianna: http://www.pipedreams-sugarcraft.co.uk/pme-no-10-dresden-tool-404-p.asp
gerripje, I've searched the fmm mats on line and they seem like a great option! Thank you.
Justbeck101: That's a great idea!!!!
Tona, do you know the brand of the general leaf veiner?
Thank you all
Marianna, I don't know why the URL was blocked, try this: http://cgi.ebay.co.uk/PME-%2310-FLOWER-LEAF-SHAPER-DRESDEN-TOOL-cake-decorating_W0QQitemZ250395379060QQcmdZViewItemQQimsxZ20090325?IMSfp=TL090325155003r12781
here is a dresden tool http://www.apieceofcakethame.co.uk/view_products.aspx?txtSearch=dresden&x=0&y=0
i have this leaf veiner Cake Art Twin Leaf Veiners
Multi-Purpose medium, made by Culpitt from this page, its 13th down, a blue one, although i dont know if ud get them in the USA. http://www.apieceofcakethame.co.uk/view_products.aspx?txtSearch=leaf+veiner&x=0&y=0
if i was doing something making a lot of a specific leaf, or flower with strong veins, id invest int he proper one, but just now, im not that bothered!
xx
cool 
glad to be of help that is a really good store, they have a great rep. website isnt the easiest to get around, but its usually worth it - call them if you have any questions and they are great.
xx
Sorry, y'all, but I'm stumped -- what's a dresden tool?
TIA!
Is a tool almost like a pencil that leaves an impression on the fondant that makes flowers look realistic. I know there a few companies that sells them. Including Michelle fosters.
Some are in wood, some are in plastic.
Edna 
Thanks for the enlightenment, Nahieli, Edna and brincess_b. I'm happy to say I actually have one of these things, I just don't know the names of any of the tools in my gumpaste flower kit. Also, the corn husk idea sounds pretty nifty, justbeck101.
Jennifer Dontz sells an awesome all-purpose 2-pc "Multi-Purpose Leaf Veiner." http://www.jenniferdontz.com/estore.php?category=veiners
In the beginning, I used the silk veining tool and Dresden tool a lot but as I've progressed, I've ended up buying all kinds of veiners, mostly First Impressions molds. The Rose Floramat rocks.
Silk veining tool (no gumpaste toolkit should ever be without one): http://www.globalsugarart.com/product.php?id=18206
Dresden tool (another must-have): http://www.globalsugarart.com/product.php?id=17238
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