Hi, welcome to the GMB. Correctly, I think the word is spatter rather than splatter, but am sure whichever word you use most people here will understand what you mean.............. If you use the Board's search facility and type in 'spatter glass' am sure you will get a lot of reading matter.
Often thought of as being a cheaply produced decorative effect, as a generalization it is created by rolling the base glass over a hot marver (flat metal plate) in order to pick up flakes, powder or pieces of coloured glass, which are then worked by further heat into the main glass object, which is then often blown into a shape of some sort ......... and as it expands so do the pieces of colour that were picked up.
Regret to say that unless you have a label or backstamp of some sort than very unlikely you are going to discover the maker.
A lot of spatter glass was produced in eastern Europe in the middle third of the C20 - that's not to say this piece is from that area, but it might give you a starting point when looking.
Just a couple of suggestion to help with future requests, please.................. dimensions of your glass object are always useful, and whilst not guaranteed to help with attribution, may do. Fussy backgrounds, such as your attractive butterflies are marvelous, but detract from the main reason for posting the picture, so.......... try using a plain uniform background............ a pale colour for coloured glass, and if possible a plain darkish colour for clear glass. You can post four separate images with each post, so providing pictures of the front elevation, plan if necessary, and importantly (which you've done anyway) a snap of the underside give the best chance of seeing all aspect of your glass.
Of course, fingers crossed that someone here might yet be able to help you.

P.S. having looked again at your glass, there's a possibility it might be from one of the Murano glass houses - just a thought.