SWMBO bought a pair of these ceiling lamps:

Above, they've got 42w 90mm globe halogen bulbs in them, two lamps running off a dimmer, which I think is an HPM trailing edge / soft start type. 
They are supposed to cast a shadow pattern on the ceiling - that's the point.  If you don't like it - then you deal with my SWMBO - I'll get her to join GZ to argue the point.  But IMO, with those globes, the filament is very small hence the shadow cast is very sharp and needs softening.
90mm diameter frosted/white bulbs are no good - very little or no shadow cast.  Smaller "normal size" bulbs don't look very good.
I have a (one) 4w "filament type" 120mm clear LED globe.  There's no mention whether these are specifically "dimmable" (but presumably not - or they'd be saying so).  These are "allume" brand.  One obvious problem is that the dimmer is rated 10w minimum, and sure enough, if the LED is run in one lamp (with the other empty), it doesn't work (glows slightly, and won't dim at all).  However, if I put a 42W halogen in the other socket, then it works perfectly, and because the LED "filament" is much larger (than the halogen) it casts a much softer shadow - perfect.  But there's a problem - 2 x 4 is still only 8w (dimmer min 10w), and even if they seem to dim perfectly is there some possibility that the dimmer or lamp will die?  Or would they even work without the resistive load of the halogen bulb in parallel?  Is there a dimmer which would work, but with minimum less than 10w?.  If there are some E27 globes, LED "faux filament" type, 90 or 120mm, clear glass, > 5w then where would I find them?  Google is not being my friend, I don't see anything on TM or at local retailers.