The campaign showcases a poignant message alongside the image of one-year-old Kfir Bibas: "Waiting for the bus home for 100 days", a stark reminder of the duration of the hostages' captivity.
The ICJ will hold sessions on Thursday and Friday in a case brought in late December accusing Israel of failing to uphold its obligations under the 1948 Genocide Convention.
The ICJ will hold hearings this week on a case brought by South Africa accusing Israel of genocide in the Gaza war and seeking an emergency suspension of its military campaign.
Several MKs have condemned his actions, including MK Sharon Nir of Yisrael Beiteinu, who suggested he resign from the Knesset.
The hearing was triggered by South Africa, which charged that Israel was in violation of the United Nations 1948 Convention on the Prevention and Punishment of Genocide.
Though the Dutch Defense Ministry would not comment on the case, a letter said "it cannot be established that the F-35s are involved in grave violations of the humanitarian laws of war."
The surprise visit is unofficial and will not include access to Gaza.