I feel your pain. This technique will only work with small bulbs, like muscari, crocus, etc. Rake over the area where you want them planted, scraping off mulch, grass, plants etc. Water it well (or wait til after rain).
Toss the bulbs randomly onto the scraped patch, toss around whatever nutrients you're using. Cover the bulbs with mulch (finer mulch is better than coarse). Cover with mesh, fencing, whatever to prevent animals from eating the bulbs. THEORETICALLY, these tiny bulbs will plant themselves. All spring bulbs have contractile roots that will pull them down into the soil to their optimum planting depth. I have tried this method with muscari and species crocus and it does work, but I don't think I got 100% of the bulbs to actually plant. I wouldn't risk this with valuable bulbs, but muscari grows like weeds here, so I toss the bulbs around with blithe abandon.
