Yes, old furniture is fabulous for making over, even the 'cheaper' end of old furniture is well made with dove tail joints etc, and often come with original handles which, if you take off before sorting the furniture, can be cleaned up beautifully.
All my furniture - apart from my sofa and my bed, is at least 70 - 80 years old, some even older. I've had it all my adult life, with no intention of changing it, as I restored, painted, waxed, whatever each piece to suit me.
Chalk paints etc were not as available 35 -40 years ago, so I used thinned down acrylics on sanded wood. Some extremely thin for colour washing, some a little thicker for painting designs, some left neat for stencilling. Once dry and hardened off, I either waxed the piece or satin varnished them.
They're still going strong, and will probably outlive me.
Non of my furniture 'matches' or 'co-ordinates' - those words are banned from here. Instead, they live with me and often have different functions according to my needs. Eg -one 1930's cupboard has been used for art materials storage, dry foods storage, and currently stores some glass and ceramic.
Freecycle is really good for this. Last year I was given 3 delightful and very old chairs. I now use them in the house as display easels for art work.
Also try charity shops, rubbish skips, your local recycling centre.