35th wedding anniversary themes and colors are traditionally coral or from the modern list, jade. Both work very well as an anniversary party theme.
If you went with coral, you have a beautiful red/ orange pink to use as the accent for your party decorations. There are lots of flowers in the coral colors; Roses, Gerbera Daisies, Iceland Poppies, Orchids, Tulips, Hibiscus.
A very fashionable color combination at the moment is coral and pale blue and gives a very bright look to a room. The look has an oriental flavour which you could use to continue your theme into the food.
If you decided with jade then you have a very clean striking color for your decoration.
For your flower decorations, green flowers are Jade Roses and green Hydrangeas, or you could use white flowers with lots of green foliage.
You can also find beautiful jade green glass bowls and candle holders, these look great lit in the evening and would add a lovely green sparkle to your room.
Or you could combine both coral and jade colors for a very bright looking anniversary party and they look amazing together as you can see in the photo below.
There is also the flower anniversary list where your 35th anniversary flower are red roses, which are probably the most popular romantic flower there is, so having a very romantic red rose themed 35th anniversary would be a big wow. You could have red rose petals scattered on the tables with candles for added sparkle or big eiffel vases with a single stems in each. A single red rose is also perfect for a small candlelit dinner for the two of you or if you are planning a surprise party then you could have a bouquet of red roses as the bouquet gift.