The Russian Peacekeeping Forces (миротворческие силы, “Mirotvorcheskie Sili”, or simply МS) in Transnistria are easily recognized by their blue and yellow “МС” markings, which are used on helmets, patches, painted on vehicles and used on signs.
Here’s how you create the МS look easy and cheap.
Patches

Russian Peacekeepers in Abkhazia
MS forces use a small, rectangular patch in skyblue, with yellow piping and the letters “MC”. This is worn either on the right arm pocket flap, or right chest pocket flap (or both). The patch can be bought from russianpatches.com (and maybe sovietarmystuff.com or soviet-propaganda.com can get them for you).
There is also a darker blue/white patch much like the blue/yellow one, that might work.
Helmets

Russian MS Helmet
Most modern russian peacekeepers use the P7 helmet, but since that helmet is almost impossible to get a hold of (and it’s like $700 if you can find it), we’re going for the cheap alternative: the russian M68 (SSh68) steel helmet. The M68 helmet can be found for between $20 and $50 at eBay, surplus stores etc, and many of the vendors of soviet army gear have them in stock. Do not confuse the M68 with the M40 WW2-era helmet, however.
This helmet can either be used with a simple flora helmet cover (available at sovietarmystuff.com for $20), or by painting on the MS markings on it. See the picture to the right for the correct look.
Basically, you paint a skyblue band around the helmet, and put the letters “MC” in yellow on the front.
Another option is to paint the entire helmet sky blue, and put the MS lettering in yellow on the front, see this example.
Hi-Viz clothing

MS with Hi-Viz vests
MS forces sometimes use high visibility vests when stationed at roadblocks, guard outposts etc. This is done to really make the MS forces stand out, especially when they are intermixed with other forces. Hi-viz clothing is not used on patrol or at base, and is completely optional. Do it if you like.
Vehicles
Vehicles are marked with a sky blue filled circle, with the yellow MS lettering in the middle. You can paint it on, or simply print it on a paper, laminate it and stick it on.
Signs

MS Checkpoint
Also not mandatory, but if you have the time and resources, creating a few MS signs is a very nice touch. All you need is a bit of sturdy material (MDF board or whatever) and some paint. Here’s an example of an MS checkpoint.