How To Make Flat Polka Dots W/ Buttercream
Decorating By jjmoore Updated 8 Oct 2007 , 2:50am by sarahnichole975
I use either a finger dipped in PS or a wet paintbrush to smooth them over.
HTH
There's usually a description of the cake under the picture - does it say the dots are b/c?
You could pm or email the posters of the cakes you like. 
Most CC members are very willing to help.
Alternately, posting a link to the photo would enable us to see what you're talking about.
Some b/c cakes have fondant dots:
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=30464
HTH
if it were me, i would try mini FBCTs. just 'draw' the polka dots on wax paper taped to a cutting board and freeze them. after they're frozen solid, pick them up off the wax paper and place them on the cake. (maybe a dot of BC on the cake where you'll place them, especially if you put them on the sides. when i made my first FBCT, i was amazed how solid it got and easy it was to work with.
now, there may very well be an easier way to do this, but i am very much an amateur, and always 'improvise' in any way i can, and this is what i would do!
*you should see me in the kitchen... i'm a total putz!
Very simple technique ... use the tip size you would like squeeze a dot of icing (keep tip close to dot even touching)let off pressure before taking tip away ...pull away to the side....let crust and then use your finger...dipped in a little bit of ps 
HTH's
Have a wonderful day!
if it were me, i would try mini FBCTs. just 'draw' the polka dots on wax paper taped to a cutting board and freeze them. after they're frozen solid, pick them up off the wax paper and place them on the cake. (maybe a dot of BC on the cake where you'll place them, especially if you put them on the sides. when i made my first FBCT, i was amazed how solid it got and easy it was to work with.
now, there may very well be an easier way to do this, but i am very much an amateur, and always 'improvise' in any way i can, and this is what i would do!
*you should see me in the kitchen... i'm a total putz!
Great idea!!! I have to try this one this weekend!
Oh applemintjackie-PS is Powdered Sugar.
Use this Rolled BC recipe that is popular on cookies ~ you color and roll it just like fondant. You can use the back end of your icing tip as a "cookie cutter" to make your dots the same size.
http://www.cakecentral.com/cake_recipe-1603-Rolled-Buttercream-Icing-Recipe.html
Good luck!
I put fondant circles on my buttercream for my son's birthday. The only thing I made sure to do was either put the fresh cut fondant circles on the cake right away, or it they dried make sure they dried with a curved surface so that they fit really well to the shape of the round cake.
Anyways..I am new at this sooo this may not be the best way, but it worked for me.
You can take a #5 tip or something similar and do the outline of the dot then fill it in with the buttercream using lines or something. You can use a knife dipped in hot water to then smooth it over. I did this once with a pawprint and it came out perfect.
I've smoothed buttercream dots and pictures before with a viva towel. I just take it and fold it up until I get a pad, and then with the smooth folded surface, I pat them smooth. Works nicely. Be sure and let them crust first though.
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