Carnival glass lamps

I have a pair of what I am fairly sure are carnival glass lamps I have not been able to find any maker marks on either lamp. They appear to have brass base for the lamp and for the light fixture. There is a location inside the bottom of the base where a small light bulb can be put to light up the base as well as the top. There are roses on the sides of the lamps both lamps function very well there were no shades with them. They are a blue color that change like carnival glass.